Grinding and polishing machine.



1. C. BLEVNEY. GRINDING AND POLISHING MACHINE.

APPLICATION FILED SEPT-5.1912.

m w w F in W B M IX 0 r T S I A A I um I I d s n e t2 H. e t a P J. C. BLEVNEL GRINDING AND POLISHING MACHINE.

APPLlCATlON FILED SEPT- 5 1912.

SHEET 2.

ATTORNEYS 2 sums Patented Apr. 18

WH'NESSES ATES rATEN'r 0am,

JOHN C. BLEVNEY, 0F NEWA, NEW JERSEY.

GRINDING AND POLISHING MACHINE.

i ,iaaoee.

Specificatiofers Patent. Patented Ap 18 1914 Application filed September 5, 1912. Serial No. 718,762.

To all whom as may concern:

Be it known that 1, JOHN C.-B1.uvnsr, a citizen of the United States, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Grinding and Polishing Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying rawings, and to characters of reference marked the invention consists,

thereon, which form a part of this specification.

lhis invention has reference, generally, to improvements in grinding and polishing machinery; and, the present invention has for its principal object, to provide an eflicient and simple mechanism whereby an endless abrasive belt may be properly and effectively operated for the purpose of providing objects of various kinds and shapes with a highly finished surface by grinding or polishing the same upon said abrasive belt.

The various specific objects of the present invention not at this time more particularly enumerated will be clearly understood from the following detailed description of this invention.

With the various objects of the present invention in view, the said invention consists, primarily, in the novel grinding and polishing mechanism hereinafter set forth; and, furthermore, in the novel arrangements and combinations of the several devices and parts, as well as in the details of the construction of the same, all of which will be more fully described in detail in the following specification and then finally embodied in the clauses of the claim which are appended to and which form an essential part of the said Specification.

The invention is clearly illustrated in the accompanying drawings, in which Figure 1 is a side elevation of a grinding and polishing mechanism showing one embodiment of the principles of the present invention. Fig. 2 is atop or plan view of the same looking at the mechanism in the direction of the arrow w in said Fig. 1. Fig. 3 is a detail longitudinal section of the driving spindle of the mechanism and the parts mounted thereon, the same being removed or detached from the machine, said view being taken on line 33 in said Fig. 2, and the same being drawn upon an enlarged scale. Fig. a is a transverse or cross-section taken on line 4-4 in said Fig. 3, looking in the direction of the arrow 31 Fig. 5 is an enlarged detail cross-section of the mechanism taken on line 5-5 in said Fig. 1 loo-king in the direction of the arrow 2, said view showing in dotted lines the operation of the mechanism for adjusting the position of the guide-wheel over Which runs an endless abrasive belt. Figs. 6, 7, 8 and 9 illustrate various methods of providing a supportingwheel, over which the abrasive belt runs, with a suitable foundation or backing surface for said abrasive belt.

Similar characters of reference are employed in all of the said above described views to indicate corresponding parts.

Referring now to the said drawings, the reference character 1 indicates a suitable standard or post, extending upwardly from a suitable base-plate or foundation 2, upon which is supported or affixed in desirable position the grinding and polishing mechanism made according to and embodying the principles of the present invention. Said grinding and polishing mechanism comprises a bracket-portion 3, which is adjustably secured to and supported by said standard or post 1 Said bracket-portion is provided at. its forward end with a yoke or forked-member 4. Connected With the forwardly projecting ends of the respective sideplates 5 of said yoke or forked-member are socket-members 6, provided with U- shaped openings or sockets 7 adapted to receive and support the bearings 8 of a driving spindle to be subsequently described in detail. By means of said socket-members 6 and its sockets 7, said bearings 8 may be removed from said yoke or forked member 4, thus rendering the driving-spindle, and parts connected therewith, detachable from the machine. The arms of said socket members 6 are provided adjacent to their free ends with vertically disposed openings 9 for the reception of a tapered lock-pin or bolt '10 which, extending across the mouth of said U-shaped openings or sockets 7 and in contact with the face of said bearings 8, close said sockets against the removal of said bearings 8 and thus hold said drivingspindle, and parts connected therewith, in its attached relation to the machine.

The reference-character 11 indicates the driving-spindle of the machine, the same being journaled in the said bearings 8. Connected with one end of said driving-spindle, and preferably forming an integral part thereof, is a driving-pulley 12. Integrally formed in connection with said drivingspindle, and preferably centrally disposed between its ends is a hub-portion 13, its outer or bearing surface llbeing tapered from end to end or cone-shaped. Said hubportion 13 is chambered interiorly to provide the interior space or chamber 15, and the walls of the same are provided with a pair of oppositely disposed longitudinal openings or slots 16 communicating with said interior-space or chamber 15. Said driving-spindle is further provided with a longitudinally extending tubular opening 17, a portion 18 of which is internally screwthreaded, preferably with threads pitched to provide twelve threads to the inch. Extending through said longitudinal tubular opening 17, and also passing through said interior space or chamber 15 of said hubportion 13, is a differential-screw 19 the butt of which is provided with exterior screw-threads 20, preferably pitched to provide twelve threads to the inch, which operatively engage said internally screw-threaded portion 18 of said driving spindle, wh1le the stem or free end of said differentialscrew, which passes through said interior space or chamber 15 of said hub-portion 13, is provided with exterior screw-threads 21, preferably pitched to provide ten threads to the inch. The butt of said differential screw projects outwardly from said tubular opening 17 and is provided with a handlepiece 22, which is accessible to the operator through the open end of said driving-pulley 12, whereby said differential screw may be turned or operated.

The reference-character 23 indicates a pair of oppositely projecting draw-dogs which are fastened together by means of binding screws 24, the latter being accessible to a tool for manipulating the same through a pair of suitable openings or holes 25 with which said hub-portion 13 is provided. When thus bound together said draw-dogs 23 are provided with a centrally disposed opening 26 which is interiorly screw-threaded with threads pitched ten to the. inch so as to be operatively engaged by the screwthreads 21 of the stem or free-end of said differential screw. The free ends of said draw-dogs 23 respectively project outwardly through said oppositely disposed longitudinal openings or slots 16 of said hub-portion 13.

The reference-character 27 indicates a suitable supporting-wheel, the hub-member 28 of which is provided with a conical opening 29 adapted to conform to the tapered bearing surface 14 of said hub-portion 13. The interior surface of said conical opening29 is provided with an annular channel or groove 30, and also a pair of oppositely located transverse slots or grooves'31 which afl'ord passages leading from the one end of said hub-member 28 into said annular channel or groove 30. When it is desired to socure said supporting-wheel 27 upon the hubportion 13 of said driving spindle 11, the same is thrust over said tapered bearing surface 14 of said hub-portion 13, and the said transverse slots or grooves 31 of its hubmember 28 are registered with said drawdogs 23 so that when said supporting-wheel 27 is pushed upon said huh-membcr 13 the said draw-dogs are caused to enter said annular channel or groove 30. When thus positioned upon said hub-member 13 said supporting-wheel is turned thereon to carry said draw-dogs into said annular channel or groove 30 beyond the said transverse slots or grooves 31. The differential-screw 19 is now turned, which operation tends to draw the said draw-dogs 23 forward, and in consequence of their engagement with said hubinember 28 of said supporting-wheel 27 also shifts said hub-member upon the tapered binding-surface 14 of said hub-portion 1.3, thereby wedging or frictionally binding said supporting-wheel tightly upon said drivingspindle so that the same will be rotated by said driving spindle. In this manner said supporting-wheel is detacliably secured upon said driving spindle 11, and a variety of supporting-wheels may be interchangeably connected operatively with the grinding and polishing mechanism.

Connected with the rearward end of said bracket-portion 3 is a rearwardly extending portion 32, the same being adapted to support, in proper location, a' bearing-block 33, which in turn supports a rearwardly extendi'ng tubular extension 34. Journaled in said bearing-block 33 and its tubular extension 34: is an adjustable carrying-rod 35, prefer ably of tubular form, provided at its rear free end with a forked member 36 in which is supported an axle-member 37 upon which is rotatably mounted an idler guide-pulley 38. An abrasive belt 39 is arranged to run over said supporting-wheel 27 and said idler guide-pulley 38, the same being driven by the former but guided as to the path of its movement by the latter as will be subsequently described. Said abrasive belt 39 may be provided with any desirable form or kind of abrasive surface, such as an emery surface, a sand surface, a rouged surface, or any other desirable form of abrasive material.

The adjustment of said guide-pulley 38 is effected in the following manner :J ournaled upon the exterior surface of said bearing-block 33 is a rotatable collar 40, the same being provided with an upwardly ex- Secured in said lug 41 is tending lug 41.

aiaaeaa a a horizontally extending stud-pin or rod 42. Secured to the forward end of said carrying-rod 35 is a fork-member 43, the upwardly projecting forked end of which straddles the forwardly projecting end of said stud-pin or rod 42 so as to be oscillated by the lateral movement of said stud pin or rod 42. Rigidly secured upon said bearingblock 33, reai'wardly of said rotatable collar 40, is a fixed collar 44 provided with an upwardly extending bracket-bearing piece 45, in which is journaled one end of a shaft 46, the opposite end of saidshaft being journaled in the rear wall of said yoke or forked member 4 of said bracket-portion 3. Secured upon said shaft 46, so as to be oscillated thereby, is a second fork-member 47 the downwardly projecting forked end of rying rod is provided.

which straddles the rearwardly projecting end of said stud-pin or rod 42 so as to oscillate the latter when saidfork-member 47 is moved against the same. A lever-member 48 is afiixed upon said shaft 46, in a convenient location, and affords means for rotating said shaft, When the mechanism above described is operated it causes a slight rotary adjustment of said carrying-rod 35, in a desired direction which in turn tips or inclines said idler guide-pulley, as illustrated by the dotted lines in said Fig. 5, in such a manner as to cause the abrasive-belt to shift laterally its path of movement from one side to another, and consequently shifts the position of the belt upon said supporting,- wheel 27. The object of such an adjustment is to render all portions of the abrasive-belt accessible to the objects to be ground or polished when the latter are applied continually at one point with relation to the said supporting wheel, and, furthermore, this adjusting mechanism renders it possible to so adjust the said guide-pulley as to cause the abrasive belt to travel true in a desired position upon said supporting-wheel 27.

In order to maintain the running abrasive-belt at a desired tension the following mechanism is provided: Secured to the rear wall of said yoke or forked member 4 of said bracket-portion 3 is a channeled guide- I block 49,.the same preferably forming an integral part of said rear wall. Slidably mounted in said channeled guide-block 49 1s a slide-block 50 provided at its lower side or'surface with a plurality of gearteeth 51. Projecting from the rearward end of said slide-block is a tail-piece 52,.

the same being constructed to enter the end of said tubular carrying-rod 35, and being provided upon its lower side or surface with a plurality of ratchet-teeth 53 which may selectively engage a stop-rib 54 with which the interior of the forward end of said carorjournaled upon a stud 55, which proin either direction.

Rotatably mounted outward moving pressure upon said carry-' ing-arm 35 by means of the engagement of the toothed tailpiece 52 with said stop-rib 54, thereby moving said guide-pulley 38 into 57 the teeth of tensioning relation to said abrasive belt 39. v

If during the course of operation of the mechanism said abrasive belt becomes stretched, the stretch may be taken up,

so as to maintain a proper operative position of said above described tensionmg means, by moving outwardly said carrying-rod 35 until its stop-rib 54 engages an advanced tooth of the ratchet-teeth 53 of said tail-piece 52, as will be clearly apparent. 7

The said supporting-wheel 27 is provided 'upon its peripheral surface with a plurality of high points 61 separated from each other by intervening low points 62. The application of the objects to be ground or p0l-. ished to the abrasive belt is. made to such part of said running abrasive belt as is supported by the supporting-wheel 27 and its peripheral surface. thus provided. The object of thus supporting and backing the abrasive belt in such a manner is to provide' a means whereby low points in the abrasive surface of the belt may be formed at intervals so as to afford a clearance space between the object to be ground or polished and said abrasive surface which will enable the abrasivesurface to clear itself of the material detached from both the object operated upon and the abrasive belt during the grinding and polishing operation, thus always maintaining a uniform abrading surface to which the object is applied and preventing the accumulation of material ground ofi of the object from filling or choking the abrasive surface of the belt. In this manner the life of the abrasive belt is greatly high quality of finish in the ground or polished surface of the object operated upon, the same being free fromscratches, burns, blisters or like blemishes.

It will of course be clearly apparent that said supporting-wheel 27 may be provided with the alternated high and low point supporting surface in a variety of ways and forms. Hence, I have illustrated in Figs.

6, 7, 8 and 9 of the drawin several different ways of providing sue a desired surface, although it will also be understood that other forms may be designed, and that I therefore, do not limit myself merely to the forms illustrated. In Fig. 6, the said supporting surface is formed by oblique lugs or ribs '63 'alternated with intervening, low points 6-1; in Fig. 7 the wheel is provided with longitudinal flanges or ribs 65 forming channels 66, in which are spaced at intervals transverse blocks 67 which may be of wood, metal, or any other suitable rigid material; in Fig. 8 the surface of the wheel is provided with a plurality of outwardly projecting lugs 68 which form high points raised above the surrounding surface 69 of the wheel which forms low points; and in Fig. 9 the surface of the wheel is-provided with perforations 70 which form low points as distinguished from the surface 71 of the wheel which constitutes the high points.

Of course, it will readily be understood that many changes may be made in the above described construction of my invention and its detailed parts, and many apparently widely different embodiments of my inventioncould be made without departing from the scope thereof, I intend, therefore, that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as'illustrative and not in a limiting sense. to be understood that the language used in the following claims is intended to cover all generic and specific features of the invention herein described and all statements of the scope of the invention, which, as a matter of language, might be said to fall therebetween. i

I claim 2-- 1. In a device of the kind described, a carrying frame, a driving spindle journaled in one end of said carrying frame, a supporting-wheel mounted on said spindle, a. bearing-block connected with said frame, a carrying rod movably supported in said bearing-block, -a guide-pulley, means supported on the outer end of said carrying-rod in which said guide-pulley is journaled, an abrasive belt running over said supportingwheel and said guide-pulley, and means connected with said frame adapted to exert an outwardly moving pressure upon said carrying-rod to tension said abrasive belt.

2. In a device of the kind described, a carrying frame, a driving-spindle journaled in one end of said carrying frame, a supporting-wheel mounted on said spindle, a bearing-block connected with said frame, a carrying-rod movably supported in said bearing-block, a guide-pulley, means sup-' ported on the outer end of said carrying-rod in which said'guide-pulley is journaled, an abrasive belt running over said supporting I also desire it justing the angle of rotation wheel and said guide pulley, means connected with said frame adapted to exert an outwardly moving pressure upon said carrying rod to tension said abrasive belt, comprising a toothed slide-block provided with a tailpiece adapted to engage said carrying rod, a stud connected with said frame, a segmental gear journaled upon said stud and meshing with said toothed slide-block, a lever arm connected with said segmental gear, and an adjustable Weight mounted upon said leverarm, and means for adjusting the angle of rotation of said guide-pulley in a vertical plane, comprising a fixed collar provided with an upwardly extending bearing portion mounted on said bearing-block, a shaft journaled at one end in said bearing-portion and at the other end in said frame, a levermember for oscillating said shaft, a forked arm mounted on said shaft, a rotatable collar provided with a supporting lug mounted on said bearing-block, a longitudinal stud-pin carried by said supporting lug, one end of said stud-pin being engaged by said forked arm of said shaft, and a second forked arm secured upon said carrying-rod and adapted to engage the opposite end of said stud-pin.

In a device of the kind described, a carrying frame, a driving-spindle journaled in one end of said carrying-frame, a support ing-Wheel mounted on said spindle, a bearing-block connected with said frame, a carrying-rod movably supported in said .bearing-block, a guide-pulley, means supported on the outer end of said carrying rod in which said guide-pulley is journaled, an abrasive belt running over said supportingwheel and said guide-pulley, means for adof said guidepulley in a vertical plane, comprising a fixed collar provided with an upwardly extending bearing portion mounted on said bearing-block, a shaft journaled at one end in said bearing-portion and at the other end in said frame, a lever member for oscillating said shaft, a forked arm mounted on said shaft, a rotatable collar provided with a supporting lug mounted on said bearingblock, a longitudinal. stud-pin carried by said supporting lug, one end of said stud pin being engaged by said forked arm of said shaft, and a second forked arm secured upon said carrying rod and adapted to engage the opposite end of said stud-pin.

4. In a device of the kind described, a carrying frame, a driving-spindle j ournaled in one end of said carrying frame, a supporting-wheel mounted on said spindle, a bearingblock connected with said frame, a carrying-rod movably supported in said bearing-block, a guide-pulley, means supported on the outer end of said carryingrod in which said guide-pulley is journaled, an abrasive belt running over said supporting-wheel and said guide-pulley, means for in said frame, a lever-member for oscillating adjusting the angle of rotation of said guide-pu1ley in a verticalplane, comprising a fixed collar provided with an upwardlyextending bearing portion mounted on said bearing-block, a shaft journaled at one end in said bearing portion and at the other end said shaft, a forked arm mounted on said shaft, a rotatable collar provided with a supporting lug mounted on said bearingblock, a longitudinal stud-pin carried by said supporting lug, one end of said stud pin being engaged by said forked arm of said shaft, and a second forked arm secured upon said carrying-rod and adapted to en gage the oppos1te end of'said stud-pin, and means adapted to exert an outwardly moving pressure upon said carrying-rod to tension said abrasive belt.

5. In a device of the kind described, a frame, a tubular driving-spindle journaled in one end of said frame, a supportingwheel, and means for detachably securing said supporting-wheel upon said drivingspindle, comprising a hollow cone-shaped hub-portion connected with said spindle provided in its circumferential surface with opening, driving spindle having threads which the butt of said difierential screw operatively engages, the stem of said differential screw engaging said internally screw-threaded opening of said draw-dogs, and said supporting wheel being provided with a hub-member having a cone-shaped 40 opening corresponding to the hub-portion of said spindle, said hub-member being further provided with an internal annular channel for the reception of said drawdogs, and a pair of transverse channels permitting the passage of said draw-dogs into said annular channel.

In testimony that I claim the invention set forth above I have hereunto set my hand this 4th day of September, 1912.

JOHN

Witnesses:

GEORGE D. RICHARDS, FREDK. H. W. FRAENTZEL.

oppositely disposed longitudinal slots, a pair of oppositely extending draw-dogs the free ends of which project through said slots, 30 said draw-dogs being provided with an internally screw-threaded centrally disposed a diiferential screw, said tubular internal screw- C. BLEVNEY. 

